What chromosomal set is characteristic for pulp cells of pine needles and sperm? Explain from what source cells and as a result of what division these cells are formed
1) in the cells of pine needles, the set of chromosomes is 2n; in pine sperm – n;
2) an adult pine plant develops from the zygote (2n) (or, the pulp cells of the needles by mitosis from other pulp cells);
3) pine sperm develop from haploid microspores (n) through mitosis
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.